Perhaps you should try some spelling variations:
chiet tach » chieu sach
thien hach » thien thanh, hien hanh
hanh tranh » canh tranh, hanh trinh, hanh trang
cua nhung » va nhung
cua hang » cua dang, cua cong, cua ban
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (thien hach)) - hanh tranh ((cua hang) OR (cua nhung)) cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chiet tach) or (thien hach)) - hanh tranh ((cua hang) OR (cua nhung)) cong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) or (thien hach)) - hanh tranh ((cua hang) OR (cua nhung)) cong dan toan cau*.